What general function does a multimeter not perform?

A multimeter is a versatile tool commonly used in electronics to measure various electrical properties such as voltage, current, and resistance. Each of these functions is integral to diagnosing and troubleshooting electrical circuits.

In the context of the question, testing audio output is not a general function of a multimeter. While a multimeter can measure the voltage of a signal, it does not have the capability to evaluate audio quality or performance, such as frequency response or clarity of sound. This type of testing typically requires specialized equipment designed for audio analysis, such as audio analyzers or oscilloscopes, to assess the characteristics of sound waves.

Thus, while multimeters excel at measuring voltage, current, and resistance, they do not perform direct assessments of audio output, making the option of testing audio output the correct answer regarding what a multimeter does not do.